A pump assembly includes pump casing (2), an impeller (14) rotatably arranged in the pump casing, a two rotation directions (A, B) electrical drive motor connected to drive the impeller and a valve arrangement (28) arranged in the pump casing to switch a flow path downstream of the impeller between two exits (24, 26) of the pump casing, depending on a rotation direction of the impeller. The valve arrangement includes a first movable valve element (34) at a first exit (24) and a second movable valve element (36) at a second exit (26). The first valve element partly closes the first exit in a closed position and is movable into an opened position by flow in the first rotation direction and the second valve element partly closes the second exit in a closed position and is movable into an opened position by flow in the second rotation direction (B).

The inventive technology, in particular embodiments thereof, may be described as an apparatus (e.g., a pump) that imparts work to and redirects a fluid, and that features an impeller configured to contact and redirect an impeller inflow along a toroidal flowpath to generate an impeller discharge that has both axial and tangential velocity components, where the axial velocity component is substantially 180 degrees relative to a direction of an impeller inflow, in a meridional plane, the apparatus also featuring a diffuser having a diffuser axis that is aligned with an impeller axis of rotation, the diffuser featuring a diffuser outlet annular radial size that is greater than a diffuser inlet annular radial size; and/or curved diffuser vanes established as part of the diffuser, that redirect the impeller discharge so as to reduce the tangential velocity components.

The invention, comprises a pumping apparatus, system and method for increasing the flow of the in a first direction to boost liquid flow and in a reverse second direction to remove blockages and/or self-clearing, with operation having an rotor/impeller that can use a shredder and/or shearing action utilizing blades for processing to pass solids, debris and other things to prevent clogging and/or self-cleaning of the unit.

Systems and methods of restarting a downhole pump for pumping downhole fluid and located in a wellbore that include determining a pump reverse rotational frequency of a downhole pump caused by downhole fluid flowing in a downhole direction using a phase locked loop. A pump motor is driven at a motor reverse rotational frequency matching the pump reverse rotational frequency. The pump motor is then driven to accelerate the pump reverse rotational frequency and thereby pump the downhole fluid in an uphole direction. The pump motor is then driven to decrease the pump reverse rotational frequency while continuing to pump the downhole fluid in the uphole direction. The pump motor is then driven to change the rotation of the downhole pump to a forward rotation at a pump forward rotational frequency to pump the downhole fluid in the uphole direction.

Wastewater pump comprising a reversible motor (110) driving a rotor (160) equipped with blades (170). The rotor (160) is a disc (165) bearing pivoting blades (170) each mounted on a radial spindle (167) borne by the rotor. Each blade (170) is composed of a plate (171) bearing an articulation node (175) engaged on the spindle and a cutter (172) on the back of the plate forming a prop supporting the plate in the active position when the rotor (160) is rotating in the forward direction (D), and the cutter (172) projecting in the peripheral direction when the rotor (160) turns in the reverse direction (R), the plate (171) being applied against the disc (165). A fixed ring surrounds the disc and bears at least one cutter (135).

A reversible grinder pump with cutter plate and cutter blade, wherein the cutter plate is attached to an inlet of the reversible grinder pump and is located adjacent to the cutter blade, wherein the cutter plate includes pairs of angled openings, wherein each of the pair of angled openings extends through the cutter plate and has a shape which is a mirror image of the other angled opening of the pair of angled openings, when viewed from above a surface of the cutter plate. The cutter blade of the reversible grinder pump contains a pair of triangular cross section, prism-shaped cutting edges, which are congruent to each other and reflective, extending in opposite directions from each other.

A pump chamber (32a), valve chambers (33a and 33b), discharge holes (33e and 33f), and flow paths (34 and 35) are integrally provided to each other in a housing (30), so that the pressure loss of the cleaning liquid “W” can be reduced. In addition, since valve chambers of the flow paths extend to the discharge holes, the cleaning liquid flowing out of the flow paths can be discharged at a portion closer to the central of the valve chambers. As a result, the outlet portions of the flow paths and the inlet portions of the discharge holes is brought closer to each other, and the turbulent of the cleaning liquid in the valve chambers can be suppressed, thereby reducing the pressure loss.

A washer pump configured to suck liquid stored in a tank and configured to jet the liquid to a surface to be cleaned. The washer pump includes: a housing attached to the tank, an impeller rotatably provided in the housing, a motor rotating the impeller, a motor accommodating portion provided in the housing and accommodating the motor, a corner portion provided in the housing and disposed between the motor accommodating portion and the tank, and a respiratory hole provided between the motor accommodating portion and the corner portion. The respiratory hole communicating an inside of the motor accommodating portion with an outside thereof.

Since the pump chamber (32a), the valve chambers (33a and 33b), the discharge holes (33e and 33f), and the flow paths (34 and 35) are integrally provided to each other in the housing (30), in the case where these are formed of separate members, a step or the like that inhibits the flow of the cleaning liquid “W” is not formed in the flow path of the cleaning liquid “W”, so that the pressure loss of the cleaning liquid “W” can be reduced. In addition, since the valve chambers (33a and 33b) of the flow paths (34 and 35) extend to the discharge holes (33e and 33f), the cleaning liquid “W” flowing out of the flow paths (34 and 35) can be discharged at a portion closer to the central of the valve chambers (33a and 33b). As a result, the outlet portions of the flow paths (34 and 35) and the inlet portions of the discharge holes (33e and 33f) is brought closer to each other, and the turbulent of the cleaning liquid “W” in the valve chambers (33a and 33b) can be suppressed, thereby reducing the pressure loss.

The present invention is a reversible pump-turbine installation positioned in a vertical borehole instead of in a conventional underground powerhouse or deep concrete powerhouse. The required plant cavitation coefficient may be achieved by simply boring a vertical borehole to the required depth rather than routing the water flow to and from a deeply buried powerhouse. A pneumatically controlled pressure relief valve may be incorporated into this invention.